Adustable dumbbell



FIG. 1 is a top, right front perspective view of an adjustable dumbbellshowing our new design;

FIG. 2 is front view thereof;

FIG. 3 is back view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings depict portions of the adjustabledumbbell that form no part of the claimed design.

CLAIM The ornamental design for an adustable dumbbell, as shown anddescribed.